Improvement in magazine-stoves



UNrrED STATES PATENT DAVID SMITH, 0F ALBANY, NEV YORK.

- IMPROVEMENT IN MAGAZINE-STOVES.

Specification forming part of Letters Patent No. 150,721, datcd May 12, 1874; application filed Mny1,1e71.

To all whom z'tmay concern 1 Be it known that I, DAVID SMITH, of the city and county of Albany and State of New York, have invented certain new and useful Improvements in Base-Burning Stoves 5 and I hereby declare the f'ollowing` to be a full, clear, and eXact description of the same,`ref erence being had to the accompanying drawing making a part of this specification, in which- Figure l represents a sectional elevation taken from front to rear; 2, a sectional elevation from side to side; Fig'. 3, a sectional plan view taken at a line on a planes with the top of the mica windows M 5 and Fig'. 4, a side viewlof the fireLpot, the casing ofthe stove being shown in a sectional elevation.

This invention relates to that class of stoves known as base-burning stoves, in which the fuel is burned out from the base of the column.

In the accompanying drawing, A represents the base of the stove. A' is a flue, made therein in the form of a horseshoe, extending around the ash-pit P in such a manner as to inclose two sides and the front thereof. B is a diving-flue, located between the firepot G, the division-plates b b, and the front wall or casing b'. B' B' are the rear side return-fines, leading from the base-due A', into which the diving-flue B discharges to the exit-flue L. All these are improvements secured to me in former Letters Patent.

The objects of this inventionare to increase the heating and the illuminating powers of the stove; to facilitate the combustion of the gases; to give more freedom to the movement of the products of combustion om the firepot to the base-flue 5 a better control for changing the currents of the heated gases 5 and a better means of regulating the flow and supply of the fuel to the re-pot by increasing or diminishing them, as the changes of the weather may require.

To present no obstacle to the ilow of the products of combustion from the surface of the incandescent coal in the fire-pot C through the opening z to the base-flue A', I decline the top portion C' of the nre-pot from the rear to the front at an angle of about forty-five degrees, as shown in Figs. l and 4;.

In my former invention the top of the firepot was in a horizontal plane, andthe hot gases were forced to strike the inside of that portion of the fire-pot which projected above the inclined surface of the fuel before their passage into the flue B, and the heat radiated from the inclined upper surface of the fuel was prevented in a great measure from passing through the mica windows in the casing surrounding the iirepot, andthe light from the inclined surface of the burning fuel was greatly obscured.

By declining the top of the fire-pot C, as dev scribed, three important results are secured, viz: First, perfect freedom for the passage of the heated gases from the entire surface of the burning fuel into the front iue B, thereby highly heating the outer casing b', and thus increasing its radiating power; secondly, an unobstructed transmission of the heat through the transparent mica windows M facing the inclined surface of the fire; and, thirdly, freer transmission of the light from the glowing coal and the flame arising therefrom for illuminating the room.

r.Io insure the combustion of the gases evolved from the surface of the fuel when at a high temperature by bringing in contact therewith highly-heated air, I makewith the divisionplates b b the air-flues D D, extending from beneath the bottom of the stove to the top of the fire-pot and near the rear thereof. The air-dues D D are contracted as they approach their upper terminations, as shown in Fig. 4, and are provided `with discharge-orifices d d, opening into the diving-ilue B, which permits the air flowing in through the iues D D to be heated by the hot gases in the tlues B and B', into which it is discharged, and with which it commingles. To further supply the heated unconsumed gases with heated air to insure a more perfect combustion of said gases, I form' on the inside of the casing b', in front of the fire-pot C, and in about the same plane with the lowest portion of its upper edge, the airflue F, to which air is admitted from the exterior of the stove through openings f', where it is heated and discharged through the. discharge-orifice fin said air-flue F into the gases entering the flue B. The air-due Fis designed tovbe in constant operation; but the air-flues D D have their supply of air regulated by dampers FFICEo G G, placed at the mouths of said flues. l l are orifices in the division-plates b b,provided with dampers Z Z', by which the draft is made either direct or revertible. The wall-section of the stove surrounding the combustion chamber J is composed principally of mica panes M,

with metal mullions of sufficient strength between the panes M to support the upper portion of the stove. The panes of mica M are arranged with their bases a little above the plane of the lowest point of the declining top c of the fire-pot, and their tops above the highest point of the same, so as to be in the best position for transmitting the heat and light from the inclined surface of the incandescent coal. The heating and illuminating powers of the stove are further increased by the use of the mica lights L 7s in the dome-section 7c thereof. The fuel-reservoir H is located centrally within the stove, and has a space surrounding it, in which the gases circulate. Its lower end terminates in a chute, h, which leads toward the rear of the stove, and discharges into the 4chute c, made with the tirepot (l. The fuel in the magazine, by this arrangement, is prevented from exerting a vertical pressure upon the fuel in the fire-pot, which lies in a loose mass in the same, which condition permits the air to pass` readily through the mass, thereby insuring a more perfect combustion. The chute c is connected with the fire-pot C at the rear, and declines from rear to front, thusinsuring a forward movement of `the coal into the tire-pot. A gate, I, provided with tines or fingers, is arranged in the lower end of the magazine I-I, and is capable of being thrust down to the bottom of the chute c, to cut off the supply of coal from the fire-pot, or of being raised to any desired distance from the bottom of the chute c, for the purposeof permitting a limited or-a full supply of coal to iiow to the firepot, as may be desired. A rod or bar, or other suitable mechanism, may be attached to the gate I for the purpose of operating it. The grate N declines at an angle corresponding with the declining top of the fire-pot, its highest point being in about the same plane with the lowest point of the chute c. Its back portion u is solid. The bars of the grate are so formed that they have their greatest width at their juncture with the solid portion n, and gradually taper forward. This construction causes the spaces n2 between the bars to be widest at the front of the grate, and to gradually taper or lessen in width as they approach rear, thereby causing the coal to be somewhat caked at the rear before passing forward to be consumed. The grate N is provided with vertical iingers or studs a3 upon the annular portion at the front thereof'. P is an ash-pan, with a horizontal bail, q, having a crook, q', at its center, and a movable handle, R. T T are rollers, used in lien of legs, having their bearings in standard t. S is a leg of ordinary construction.

The declining grate, as herein shown and described, I claim only when it forms a continuation of the chute c at the lower end of the fuelmagazine. I reserve the right to a broad claim to said grate for afuture application. I make no claim to the flue F having the orifices fj, as described, nor do I claim any of the parts hereinv shown and described, except as herein after expressly claimed.

Having described my improvements, what I claim as new and useful, and desire to secure by Letters Patent, is-

l. The tire-pot G, provided with the declining top c', and connected at the rear with the fuel-reservoir H, substantially as and for the purposes set forth.

2. The grate N, declined from rear to front, to form a continuation of the chute cat the lower end' of the fuel-magazine H, as and for the purposes hereinbefore set forth.

3. The air-dues D D, provided with the discharge-orifices d d, combined with the fire-pot C and the flue B, to draw cold air from a point beneath the hre-pot C and discharge it into the flue B, as and for the purpose set forth.

4. The gate I, provided with tines or fingers, combined with the reservoir H, and capable of being thrust down to the bottom of the chute c to cut off the supply of fuel from the iire-pot, and of being drawn up within the reservoir to vpermit a limited or full supply of fuel to iiow to the fire-pot, substantially as hereinbefore set forth.

DAVID SMITH.

IVitnesses:

ROBERT HILLsoN, Clins. J. SELKIRK. 

